Chemical Reactions

Synthesis Reactions

Synthesis reactions are when two or more substances react to produce a single product.

Decomposition Reactions

Decomposition reactions are when one single compound breaks down into two or more elements or new compounds.

Combustion Reactions

In combustion reactions, oxygen combines with a substance and releases energy in the form of heat and light.

Double Replacement Reactions

Double replacement reactions happen when two compounds undergo an exchange of atoms.

Neutralization Reactions

Neutralization reactions are also known as acid-base reactions, where an acid and a base combine to form water and a salt.

Chemical Equations

Chemical reactions are shown as chemical equations.

Reactants

Chemical equations display the formula(s) of the initial compound(s), reactants, with an arrow towards the new compound(s), products.

Products

The new compound(s) formed in a chemical reaction.

The Law of Conservation of Matter

The number of individual atoms must be of equal quantity on both the reactant and product side of the chemical equation.

Physical Changes vs Chemical Reactions

Physical changes modify the appearance or form of one substance, whereas chemical reactions result in at least one new substance with new properties.

Synthesis Reaction Equation

A + B → AB

Decomposition Reaction Equation

AB → A + B

Combustion Reaction Products

Combustion often generates carbon dioxide and water.

Double Replacement Reaction Equation

AX + BY → AY + BX

Precipitate

When one of the products in a double replacement reaction is a solid.